Severing apparatus



United States Patent 797,886 8/1905 Deely lnventor Christopher R. RiceWakefield, Massachusetts 693,585

Dec. 26, 1967 Dec. 1, 1970 Polaroid Corporation Cambridge, Massachusettsa corporation of Delaware Appl. No. Filed Patented Assignee SEVERINGAPPARATUS 25 Claims, 5 Drawing Figs.

U.S. Cl .I 83/117, 83/342, 83/346, 83/672 Int. Cl B26d 1/56 FieldofSearch..... 83/116, 117, 342, 346, 347, 672, 677, 663, 665, 659

References Cited UNITED STATES PATENTS 1,158,180 10/1915 Cohn 83/3461,577,619 3/1926 Gammeter 83/342 1,580,916 4/1926 Putt 83/342 2,183,72212/1939 Newman. 83/342X 2,257,336 9/1941 Feurt 83/341X 3,071,175 1/1963Karkoska 83/672X 3,247,746 4/1966 Nystrand 83/342 FOREIGN PATENTS931,256 10/1947 France 83/342 Primary Examiner-James M. MeisterAttorneys-Brown and Mikulka, William D. Roberson and James L. NealABSTRACT: This disclosure involves a pair of rollers for drawing sheetmaterial therebetween and severing the sheet material as it is drawnbetween the rollers. The rollers are disclosed in conjunction withapparatus for laminating a succession of discrete sheet segments to acontinuous web and severing the web between each segment.

Patented Dec. 1, 1970 Sheet 2 of 2 llllllll l IIII LINE us VACfi/wwozazjma.

agma ATTORNEYS BRIEF SUMMARY OF THE INVENTION A This invention concernssevering apparatus wherein a pair of rollers are cooperatively mountedfor drawing sheet material therebetween and severing the sheet materialas it is drawn between them. One roller includes a blade means and bladesupporting-means which is easily adjustable or removable. The otherroller includes cooperating anvil means which is wide relative to theblade means. As sheet material is drawn between the rollers, it issqueezed between the blade means and the anvil means and severed.

In a preferred embodiment, this invention is used in conjunction withapparatus for laminating a succession of photographic prints to acontinuous transparent plastic sheet and severing the plastic sheetbetween each print. This apparatus has a particular use in theproduction of identification cards from a photographic print bearingdesired identification information. Photographic prints of the typeproduced by the wellknown color diffusion transfer process are ofparticular ad- The larninator must be capable of rapid continuousoperation. Accordingly, the severing means involved must require littlemaintenance and be easy to remove and replace or repair when maintenanceis required. The apparatus of this invention accomplishes theseobjectives. Since the blade means is mounted upon an easily removablesupport and the anvil is wide relative to the blade means, the supportand the blade means may quickly be removed, replaced and alined with theanvil, precise registration between the blade and the anvil not beingnecessary since the' blade will cooperate with any portion of therelatively wide anvil.

Another advantage of the apparatus of this invention is its economy. Inthe preferred embodiment of the invention subsequently disclosed indetail, the blade means comprises means defining an elongated roundedsurface, such as a wire,

disposed along the support means. It will be appreciated that therounded surface defined by the wire is capable of squeezing the sheetmaterial between it and the anvil means until the vantage. Thesephotographic products include a sheet of photosensitive material and acolor print-receiving layer which are superposed during development ofthe color negative and production of the color print. Thereafter, theprintreceiving layer is stripped from the photosensitive sheet.

When freshly stripped from the photosensitive material theprint is wetand if, while it is in this wet condition, it is pressed against thesurface of a rigid or sernirigid vinyl having a suitable coating with ahydrolyzed surface; a virtually indestructible bond is formed betweenthe hydrolyzed surface and wet surface of the color print. This bond andthe materials necessary for the formation thereof are described in a US.

Pat. application in the names of Howard C. Haas and Harold O. Buzzell,Ser. No. 451,894, filed Apr. 29, 1965, and entitled, Laminations.

It is anticipated that the photographic positive print will be laminatedto the hydrolyzed vinyl surface immediately after it is stripped fromthe photosensitive material and thus while it remains wet. If, however,the print is allowed to dry prior to lamination, the lamination may beeffected by wetting either the hydrolyzed surface or the image-bearingsurface of the print prior to pressing the print and the hydrolyzedsurface together.

High pressures are not necessary to achieve the bond, contact issufficient, but firm pressure is necessary during the laminatingoperation to insure complete surface-to-surface contact of thephotographic print and the hydrolyzed surface and to expel air which maytend to be trapped between the two layers.

The herein disclosed preferred embodiment of this invention includes apair of rollers having resilient, engaging surfaces; severing means onone roller; anvil means on the other roller; means for supporting acontinuous plastic web supply and means to guide the end of the web andthe print into the nip of the rollers. The print and the plastic webpass between the rollers upon rotation thereof, the wet surface of thephotographic print and the hydrolyzed surface of the web being arrangedin face-to-face contact. Contact is assured by the engaging surfaces ofthe rollers and since the surfaces of the lamina adhere to each otherupon contact, the lamination is formed as the materials pass between therollers without the BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is across-sectional view of one preferred embodiment of the severingapparatus of this invention;

FIG. 2 ,is a view of the preferred embodiment of FIG. 1 taken along thecommon tangent of the pair of rollers;

FIG. 3 is a cross-sectional view along line 3-3 of FIG. 2;

FIG. 4 is a schematic wiring diagram of an electrical control systemuseful in connection with the preferred embodiment of FIG. 1; and

FIG. 5 is a cross-sectional end view of another embodiment of thisinvention.

DETAILED DESCRIPTION OF THE DRAWINGS A preferred embodiment of thesevering apparatus of this invention will now be described in connectionwith the laminating and severing apparatus discussed above and shown inFIGS. 1-4.

Rollers l0 and 12, of equal radius, are mounted for rotation aboutparallel axes in housing 14. A spool 16, carrying a roll of thecontinuous plastic sheet 18, is rotatably mounted in housing 14 andlocated adjacent rollers 10 and 12 such that the leading end of sheet 18is drawn over roller 12 and engaged in nip 19 of the rollers. An element20, on housing 14, includes a tapered slot 22 for guiding a photographicprint 24 into the nip of the rollers so that it will. be drawn betweenthe rollers upon rotation thereof. Rollers 10 and 12 may consistprimarily of relatively rigid cylindrical portions 26 and 28 mounted onshafts 30 and 32, abutting resilient sleeves 34 and 36 covering portions26 and 28, severing means 38 on roller 10 and means 40 on roller 12forming an anvil for cooperation with severing means 38.

Severing means 38 is mounted in cutout portion 42 of roller 10 andcomprises a blade means for severing sheet 18, support means 44 for theblade means and bearing plate 46. The blade means may be characterizedby means defining an elongated rounded surface which, in the preferredembodiment, takes the form of wire 48 having a diameter substantiallyequal to the thickness of sheet 18. The wire is attached to supportmeans 44 by wrapping it around screws 50 in the ends of the supportmeans and tightening the screws. Severing means 38 also includes supportscrews 52 and setscrews 54 for properly positioning the blade means.

Support means 44 forms an elongated bar, complementary in shape tocutout portion 42, having one arcuate side 56 with a radiussubstantially equal to the radius of roller m. The support meansincludes unthreaded openings 58 having shoulders 60 for accommodatingthe support screws and threaded openings 62 for the setscrews. Thesupport means is adapted to be mounted within the roller, adjacent itssurface, so that its arcuate surface conforms generally to the cutout ofthe roller, the exact position of the support means being determined byadjustment of the aforesaid means. In the preferred embodiment shown inFIGS. l3, the arcuate surface of support means 44 is located radiallyinward of the uncompressed resilient surface 34 of roller by a distancesubstantially equal to the thickness of wire 48. Preferably the blademeans, or wire, is disposed along the arcuate surface of the supportmeans at approximately a 4 angular orientation to the axis of roller 10,helically of its axis.

Bearing plate 6, setscrews 54 and support screws 52 serve to accuratelyorient arcuate surface 56 relative to the surface of roller 10 and anvilmeans 40. The bearing plate is located at the innermost surface ofcutout portion 42 of roller 10 to distribute the forces applied theretoby the setscrews.

Support screws 52 each include threaded shaft portion 64, unthreadedshaft portion 66 and enlarged head portion 68. The headportioncooperates with shoulder 60 and is configured for a flush fitwith the arcuate surface of support means 44. setscrews 54 are threadedalong their entire lengths and include setscrews for permittingengagement thereof by an appropriate wrench or the like. Head portions72 of the setscrews are configured for a flush fit with arcuate surface56 of support means 44.

Support screws 52 pass through openings 74 in support means 44, throughopenings 76 in bearing plate 46 and into threaded openings 78 in roller10. Screws 52 are turned down into openings 78 until arcuate surface 56of the support means is located at approximately the correct position.Setscrews are then adjusted relative to plate 46 for moving the supportmeans radially outward of roller 10 until it is held tightly betweenhead portions 68 of support screws 52 and the locations at which thesetscrews bear against plate 46. Support screws 52 and setscre'ws 54,are then adjusted until wire 48 is accurately positioned for continuouscontact with anvil means 40.

Anvil means 40 defines a bar which includes arcuate surface 80 having aradius substantially equal to the radius of roller 12. Anvil means 40further includes unthreaded openings 58 having shoulders 60 throughwhich screws 52 may pass. Roller 12 includes two threaded openings 78for mating with the thread shank portions 64 of screws 52. Screws arepassed through openings 58 and turned into threaded openings 78 toproperly locate surface 80 of anvil means 40.

The anvil forms a rigid, relatively incompressible surface,substantially wider than the blade means for cooperation with severingmeans 38 to perform the severing operation. The blade means maycooperate with any portion of the anvil means and since the anvil meansis substantially wider than the blade means, the two parts do not haveto be precisely alined axially of the rollers to mate. The onlyadjustment necessary is the above-described radial alinement effected bythe support screws and setscrews.

In the preferred embodiment of the invention herein described, arcuatesurface 80 is positioned radially outward of the axis of roller 12 by adistance equal to the uncompressed radius of the roller so it is flushwith the uncompressed resilient surface of the roller.

Since resilient sleeves 34 and 36 abut and surface 56 of support means44 is located radially inward of the uncompressed resilient surface ofroller 10 by a distance equal to the thickness of wire 48 and sincesurface 80 of anvil means 40 is flush with the uncompressed resilientsurface of roller I2, the wire engages surface 80 once per revolution ofthe rollers to perform the severing operation.

Thelaminating and severing apparatus may be electrically driven in amanner described below. When the drive means is activated, the rollersmake one complete revolution and automatically stop. The position fromwhich they start and at which they stop is shown in FIG. 1, thatposition being the one occupied by the rollers just subsequent to thecompletion of the severing operation, which operation will also besubsequently described.

A color print 24, when first stripped from the image-receiving negativeis wet and while in this wet condition, it is inserted in tapered slot22 in member 20 until it abuts the blade means and the leading end ofsheet 18 near the nip of rollers 10 and 12. Actuating button 82 (FIG. 1)of switch 34 (FIG. is then depressed to cause the electrical drive meansto drive the rollers such that photographic print 24 and plastic sheet18 are drawn therebetween in face-to-face contact. The print and sheetare compressed between the rollers so that the wet surface of colorprint 24 is pressed evenly against the hydrolyzed surface of sheet 18,whereby the surfaces are securely bonded together in the mannerdescribed in the above-mentioned Haas and Buzzell U.S. Pat. applicationSer. No. 451,894.

The linear extent of the circumference of each of the rollers isslightly greater than the length of the photographic print, thus uponone revolution of the rollers the photographic print will passcompletely between the nip of the rollers. Severing means 38 and anvilmeans 46 are at least as long as sheet 18 is wide and are so arranged inrollers 10 and 12, respectively, that they cooperate to sever plasticsheet material I8 at the nip of the rollers after photographic print 24has completely passed therethrough. Thus, upon one revolution of rollers10' and 12, the lamination of the photographic print to the plastic webis effected and the plastic web is severed. The severed laminate dropsdown chute 84 and the rollers are abruptly stopped in this postseveringposition. The new leading edge of sheet 18 remains gripped in the nip ofrollers 10 and 12, between resilient abutting surfaces 34 and 36. Therollers are appropriately positioned for insertion of another print andrepetition of the laminating and severing operation.

Blade means, or wire 48, is preferrably installed in roller 10 inslightly helical fashion, as described above. This construction causesthe severing operation to begin along one edge of plastic sheet 18 andproceed thereacross, in scissorlike fashion, to the other edge. The cutestablished by this apparatus is superior to that effected by apparatusforming a simultaneous cut across the width of the web since the cutwhich proceeds from edge to edge is easier to produce and creates lessshock on the machine than the simultaneous cut. It should, however, beunderstood that blade means 38 may be alined parallel to the rotationalaxis of roller 10 to effect the entire cut at once, if so desired. Thecut produced by the helical blade arrangement does not extend across theweb in precise perpendicular alinement to the edge of the web, butproceeds at an angle slightly larger than This result is notobjectionable since the laminated print is to be subjected to a furtheroperation for trimming it to a precise size and shape.

The rotational displacement of blade means 48 and anvil means 40 fromthe nip of rollers 10 and 12 is equal, as may be seen in FIG. 3. Thisrelationship is maintained by a gearing system interconnecting the tworollers and connecting them to an electric drive motor 52. The gearingsystem, as well as the electric motor, is mounted in housing 86 and maybe of any appropriate conventional construction, not shown. When wire 48and anvil 40 move toward and to the severing position at the nip ofrollers 10 and 12, wire 48 presses against sheet 18 and squeezes thesheet between the wire and anvil means 40. As the wire moves intosubstantial engagement with anvil means 40, sheet 18 is squeezed to theextent that it is completely severed.

The schematic wiring diagram shown in FIG. twill now be described inrelation to the operation of the laminating and severing apparatus. Therotation of rollers 10 and 12 must be terminated in an abrupt andpositive manner just after completion of the severing operation so theywill be properly positioned for beginning the next laminating andsevering cycle. The rollers tend to continue rotation, due to momentum,

after the power is cut ofi. If this continued rotation is permitted, therollers will move past the desired postsevering stopping position. Thisovertravel will cause the rollers to be positioned such that thesevering operation of the next laminating and severing cycle will becompleted prior to the completion of one revolution of the rollers andthus be completed prior to completion of the laminating operation.

A capacitor discharge electric brake is effective for securing thedesired stopping action. Switch means 88, operative in response toeccentric cam 90 on rotary shaft 32, and switch 84 establish a sequenceof operation whereby armature winding 92 of motor 94 is energized toinitiate rotation, capacitor 96 is charged, the line current to winding92 and capacitor 96 is cut off in response to one revolution of rollersand 12 and the capacitor discharges to apply a direct current acrosswinding 92 to terminate rotation. Application of direct current acrossthe armature winding induces a magnetic. force therein which locks thearmature of motor 94, and thus all rotary parts, against furtherrotation.

The operation will now be described in more detail. After insertion ofprint 24 into the nip'of rollers 10 and 12 as described above, button 82is depressed to close momentary contact switch 84 to thereby completethe circuit through winding 92'and through line 98, diode 100, resistor102 and capacitor 96. This serves to initiate rotation of all rotaryparts including cam 90 and to begin charging capacitor 96.

Cam 90 is so constructed that raised portion 104 thereof is effective tourge plunger 106 in a first direction against the bias of spring 108.When the plunger is so moved contact arms 110 and 112, which form a partof the staggered throw, double pole, double throw switch means 88, arein contact with poles 114 and 116, respectively. Upon initial rotationof cam 90, plunger 106 rides off raised portion 104 of the cam such thatthe force of spring 108 moves the plunger in a second direction,oppositeto the first. In response to movement of plunger 106 in thesecond direction, contact arm 1 10 moves from pole 114 into contact withpole 118 thus shunting momentary contact switch 84 so that the circuitremains completed after momentary contact switch 84 is opened. Justsubsequent to movement of contact arm 110, contact arm 112 moves frompole 116 to unconnected pole 120. After one revolution of rollers 10 and12 and cam 90, thus just after the completion of the severing operation,portion 104 of the cam moves plunger 104 back in the first direction toreverse the switching action. Contact arm 112 first moves away from poleI 120 and into contact with pole 116; then arm 110 moves from pole 118to pole 114. Movement of arm 110 from pole 11% opens the circuit thusdisconnecting winding 92 and all other components, including capacitor96, from the line current. Connection of arm 110 with pole 114, however,completes a circuit through winding 92, capacitor96, "resistor 102, line122, pole 116, arm 112, pole 114 and arm 110 to allow the capacitor todischarge and thereby apply the aforesaid direct current acrosswinding-92 to terminate rotation. Switch means 88 is now in the positionit occupied prior to closure of switch I 84 and the rollers have beenstopped at the desired postsevering position. The laminating apparatusis thus ready for reactuation. I

It should of course be understood that the laminating apparatus and thedrive means and circuitry therefor are shown and described by way ofexample only and that'the severing apparatus defined by the claims is ofgeneral application.

Another embodiment of the invention is shown in FIG. 5. Rollers 124 and126 are firm and relatively incompressible. Severing means 38 is mountedin roller 124 so that arcuate surface 56 of support means 44 is locatedsubstantially flush with the surface of roller 124. The severingelement, which takes the form of wire 48, is drawn helically across thesupport means. Roller 126 presents a continuous firrn surface so thatthe zone thereof which cooperates with severing means 38 comprises theanvil means. Rollers 124 and 126 are spaced apart by a distancesubstantially equal to their combined radii plus the thickness of wire48. The apparatus of FIG. 5 operates identically to the apparatusdiscussed above. It should be observed however, that for sheet 128 to bedrawn between rollers 1245 and 126 and compressed, it must be at leastsomewhat thicker than the width of gap 130 formed at the nip of therollers.

A further embodiment of the invention may involve apparatus similar tothat shown in FIG. 5 wherein wire 4% is simply drawn across the firmsurface of roller 124 and the rollers are spaced apart by a distanceequaling not less than the sum of their combined radii plus the diameterof the wire.

It should also be noted that apparatus may be constructed according tothis invention wherein one roller is characterized by a-resilientsurface and the other is characterized by a firm surface.

Obviously, the rollers may be of different radii; for example, when theanvil bearing roller presents a continuous relatively firm surface andwhen the rollers include several appropriately spaced severing means oranvil means or both.

Since certain changes may be made in the above apparatus withoutdeparting from the scope of the invention herein involved, it isintended that all matter contained in the above description or shown inthe accompanying drawing shall be interpreted as illustrative and not ina limiting sense.

I claim:

1. Severing apparatus comprising:

a. a pair of rollers cooperatively mounted for drawing sheet materialtherebetween;

b. relatively firm support means extending across one of said rollers,the axial extent of said support means along the one roller being notless than the width of the portion of said sheet material to be severed;

c. blade means comprising an elongated flexible member having a roundedsevering surface, said member being drawn tautly along said supportmeans; and

d. a relatively firm, smooth anvil surface extending across the otherroller for intermittent cooperative severing action with said blademeans upon rotation of said rollers, whereby said sheet material issevered as it is drawn between said rollers. I

2. Apparatus according to claim 1 wherein at least one of said rollershas a resilient surface.

3. Apparatus according to claim 2 wherein the surfaces of said rollersabut.

4. Apparatus according to claim 1 wherein both said rollers haveresilient surfaces.

5. Apparatus according to claim 4 wherein said rollers abut.

6. Apparatus according to claim 1 wherein said blade means is helicallydisposed about said one roller.

7'. Apparatus according to claim 1 wherein the surface of said supportmeans upon which saidblade means is supported the surfaces of 'is ofarcuate configuration.

8. Apparatus according to claim 7 wherein said blade means comprises awire drawn tautly over said arcuate surface.

9. Apparatus according to claim 8 wherein said wire is helicallydisposed along said arcuate surface.

10. Apparatus according to claim 9 wherein said rollers have resilientabutting surfaces. I

11. Apparatus according to claim 10 wherein:

a. said blade means is positioned adjacent the surface of the one saidroller at a distance from the axis thereof not in excess of theuncompressed radius of said one roller; and

b. said anvil means is positioned adjacent the surface of the other ofsaid rollers at a distance from said other axis thereof not less thanthe uncompressed radius of said other roller.

12. Apparatus according to claim 11 further comprising means forvariably adjusting said distance between said blade means and said axisof said one roller.

13. Apparatus according to claim 12 wherein said adjusting means iseffective to independently vary the said distance between said blademeans and said axis of said one roller at least two spaced locations.

14. Apparatus according to claim 2 wherein said rollers are mounted forrotation about coplanar axes to form a nip for rig said sheet materialtherebetween, said axes being ,d apart by a distance not exceeding thecompressed radii r d rollers and less than the compressed radii of saidrollers s the thickness of said sheet material.

15. Apparatus according to claim 14 wherein said blade means ispositioned adjacent the surface of said one roller at a distance fromthe axis thereof substantially equal to the uncompressed radius of saidone roller plus the thickness of said sheet material 16. Apparatusaccording to claim 15 further comprising adjusting means for varying theradial distance between said blade means and said axis of said oneroller.

17. Apparatus according to claim 16 wherein said adjusting means iseffective to independently vary said radial distance between said blademeans and said axis of said one roll at least two spaced locations.

l8. Severing apparatus comprising:

a. a pair of rollers having abutting resilient surfaces, said rollersbeing cooperatively mounted for drawing sheet material therebetween;

b. relatively firm support means defining a smooth arcuate supportingsurface extending across one of said rollers, the axial extent of saidsupporting surface being not less than width of the portion of saidsheet material to be severed;

c. a taut wire laid across the outer periphery of said arcuatesupporting surface, helically of said one roller with its opposite endsreleasably connected to said support means; and

d. a relatively firm, smooth arcuate anvil surface extending across theother roller for intermittent cooperation with said taut wire to seversaid sheet material between said taut wire and said anvil surface uponrotation of said rollers as said sheet material is drawn between saidrollers.

19. Severing apparatus according to claim 18 further comprising meansfor variably adjusting the position of said support means radially ofsaid one roller.

20. Severing apparatus according to claim 18 wherein the rotational axesof said resilient rollers are parallel and spaced apart by a distancenot exceeding the sum of the uncompressed radii of said rollers 21.Severing means according to claim 1 further comprising means forvariably adjusting the position of said support means radially of saidone roller.

22. Apparatus for laminating in face-to-face relation, a pair of sheetmaterials, at least one of which is in continuous web form, and severingportions of said web laminated to the other of said materials from theremainder of said web, said apparatus comprising in combination:

a. a pair of rollers having resilient surfaces cooperatively mounted fordrawing said sheet materials therebetween in face-to-face relationship;

b. relatively firm support means defining a smooth arcuate supportsurface extending across one of said rollers, the axial extent of saidsupport surface along the one roller being not less than the width ofthe portion of said sheet to be severed;

c. a flexible wire laid tautly across the outer periphery of said smoothsupport surface and releasably connected to said support means; and d.relatively firm smooth arcuate anvil means extending paratus com risingin combination:

a. a pair 0 rollers, at least one of which has a resilient sur face,cooperatively mounted for rotation about substantially parallel axes fordrawing said sheet materials therebetween in face-to-face relationship,said rollers being mounted for rotation about fixed parallel axes;

b. relatively firm support means defining a smooth arcuate supportsurface extending across one of said rollers, the axial extent of saidsupport means along the one roller being not less than the width of theportion of said sheet to be severed;

c. a flexible wire laid tautly across the outer periphery of said smoothsupport surface and releasably connected to said support means; and

d. a relatively firm smooth arcuate anvil surface extending across theother roller for intermittent cooperative severing action with said wireupon rotation of said rollers, the radial distance from the rotationalaxis of the one roller to the surface of said wire which cooperates withsaid anvil surface plus the radial distance from the rotational axis ofthe other roller to said anvil surface not exceeding the sum of theuncompressed radii of said rollers, whereby a leading portion of saidcontinuous web may be continuously compressively engaged between saidrollers and said continuous web will be severed as said sheet materialsare drawn between rollers.

24. Apparatus according to claim 23 wherein said support means definesan arcuate surface substantially conforming to the configuration of thearcuate surface of said roller and wherein said wire is helicallydisposed about said support means so that all portions of the surface ofsaid wire which cooperate with said anvil surface of said wire whichcooperate with said anvil surface are radially displaced equally fromthe rotational axis of the one roller.

25. Apparatus according to claim 24 further comprising means forvariably adjusting the position of said support surface, and thereby theposition of said wire, radially of said one roller.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION pa ent No,3,543,622 Dated December 1, 1970 Inventor(s) chrlstopher Rice It iscertified that error appears in the above-identified patent and thatsaid Letters Patent are hereby corrected as shown below:

Column 3, line 28, "setscrews" should read Setscrews line 29,"setscrews" should read sockets 70 Column 6 line 68, "said other" shouldread the Column 7, line 1, after "at" insert." at line 7, "compressed"should read uncompressed Column 8, line 10, "outer" should read otherSigned and sealed this 30th day of May 1972.

,(SEAL) Attest:

EDWARD M.FLETCHER,JR. ROBERT GOTTSCHALK Attesting Officer Commissionerof Pate

